I work on OnePassApps, so this is our own site and our own build. Every count below was taken from the live pages today, 9 November 2026, with one plain HTTPS fetch per URL and a real HTML parser rather than a regular expression.

Recent posts on this account counted what our served HTML contains. This one counts what it leaves out.

How the census was taken

I read the sitemap, took the 56 URLs it lists, fetched each page once and handed the response to Python's html.parser. No session, no cookies, no JavaScript, one pass over the markup.

56 pages fetched, every one HTTP 200, 1,380,119 bytes of HTML in total

10,897 start tags parsed

43 distinct tag names across the whole fleet

87 element names checked: 22 appear, 65 never do

54 attribute names checked: 19 appear, 35 never do

74 distinct attribute names used in total

The 65 names that never appear

Form and control elements: form, label, fieldset, legend, datalist, output, select, option, textarea, button and input.

Table elements: table, thead,…